exam1sp2009f3 - GeneralChemistryI Examination1...

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General Chemistry I Examination 1 Name___________________________________ R. Lopez de la Vega MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Calculate the atomic mass of element ʺ X ʺ , if it has 2 naturally occurring isotopes with the following masses and natural abundances: X - 45 44.8776 amu 32.88% X - 47 46.9443 amu 67.12% A) 46.34 amu B) 46.84 amu C) 45.91 amu D) 44.99 amu E) 46.27 amu 1) 2) A substance composed of 2 or more elements in a fixed, definite proportion is considered A) an alloy. B) a heterogeneous mixture. C) a solution. D) a compound. E) a homogeneous mixture. 2) 3) Determine the volume of hexane that contains 5.33 × 10 22 molecules of hexane. The density of hexane is 0.6548 g/mL and its molar mass is 86.17 g/mol. A) 8.59 mL B) 12.4 mL C) 13.5 mL D) 11.7 mL E) 7.40 mL 3) 4) Which of the following statements about energy is FALSE?
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